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January 14, 2016
www.ModulusArms.com | Heavy-Duty Universal AR-15 80% Jig Instructions
5
Buffer Support and Rear Support
: Thread the Buffer Support into the Lower Receiver in the location
shown in Step 1. Thread the Buffer Support into the Lower Receiver (clockwise) as shown in Step 2.
Thread the Buffer Support into the Lower Receiver until the Buffer Support is below the rear surface of
the lower, then further turn clockwise until the three screw holes are aligned vertically as shown in Step
3. Using two of the ½” long screws, attach the rear support as seen in Step 4. Do no tighten, yet. Make
sure the rear support is in contact with the lower receiver rear surface. If it is not in contact, you must
thread the buffer support in further. On some lower receivers, especially polymer, the buffer support
can go in snug. Threading in two of the screws to use as a handle can help to install the buffer support.
Figure 5: Buffer Support and Rear Support Attachment
Step 1
Step 2
Step 3
Step 4